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https://issues.apache.org/jira/browse/HBASE-27725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17701555#comment-17701555
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Bryan Beaudreault commented on HBASE-27725:
-------------------------------------------
See if HBASE-27681 solves this for you. In there we removed the
ConcurrentHashMap from table metrics.
> HBase blocking thread on
> java.util.concurrent.ConcurrentHashMap.computeIfAbsent
> -------------------------------------------------------------------------------
>
> Key: HBASE-27725
> URL: https://issues.apache.org/jira/browse/HBASE-27725
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Reporter: chenfengge
> Priority: Major
>
> Made hbase pe RandomRead test for 100% memory-cache in HBase 2.5.0 before.
> We found that there are many blocking regionserver handler threads, and our
> cpu utilisation percentage is about 50% and cannot increase anymore.
> Here is the blocking stack:
> RpcServer.default.FPBQ.Fifo.handler=116,port=16020" #299 daemon prio=5
> os_prio=0 tid=0x0000ffff825d5000 nid=0x208e51 waiting for monitor entry
> [0x0000ffbe67734000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1674)
> - waiting to lock <0x0000fff75f465128> (a
> java.util.concurrent.ConcurrentHashMap$Node)
> at
> org.apache.hadoop.hbase.regionserver.MetricsTableQueryMeterImpl.getOrCreateTableMeter(MetricsTableQueryMeterImpl.java:77)
> at
> org.apache.hadoop.hbase.regionserver.MetricsTableQueryMeterImpl.updateTableReadQueryMeter(MetricsTableQueryMeterImpl.java:82)
> at
> org.apache.hadoop.hbase.regionserver.RegionServerTableMetrics.updateTableReadQueryMeter(RegionServerTableMetrics.java:93)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegionServer.updateReadQueryMeter(MetricsRegionServer.java:283)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.metricsUpdateForGet(HRegion.java:7401)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2667)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2567)
> at
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:45945)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:385)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:124)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:102)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:82)
>
>
>
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